Image (Paderborn University, T. Schapeler und N. Lamberty): In this two-dimensional histogram, the elliptical clusters correspond to different photon-number events registered by the SNSPD. This is a result from the principal component analysis (PCA), which was applied in this work.
Recently, it has been shown that so-called "superconducting nanowire single photon detectors" (SNSPD) can not only provide information about the presence or absence of photons, but also resolve the number of incident photons in a laser pulse. In this work, Timon Schapeler and Niklas Lamberty from the group Mesoscopic Quantum Optics investigated where this photon-number information is located on the electrical output signal (trace) of the SNSPD…
Horizon Europe is the European Union's framework program for research and innovation in Europe for the period of 2021 – 2027. On March 14, the Ministry of Culture and Science in North Rhine-Westphalia (MKW) organized a half-time event entitled "Horizont Europa.NRW – Erfolge im Blick". The Institute for Photonic Quantum Systems (PhoQS) was also represented at this event, which took place in Düsseldorf: The LINQs project, which is led by Prof. Dr.…
Vom 23. bis 27. Juni 2024 fand in Rotterdam die Optica Quantum 2.0 2024 statt. Die Konferenz bringt Akteur*innen aus Wissenschaft, Industrie und Politik zusammen mit dem Ziel, die Nutzbarkeit von Quantensystemen und somit die Weiterentwicklung von Quantentechnologien und -wissenschaft voranzutreiben.
Auch Wissenschaftler*innen des PhoQS waren auf der "Quantum 2.0" vertreten. So stellten Prof. Dr. Tim Bartley, Dr. Frederik Thiele, Nina Lange und…
Photo (Paderborn University, Alexandra Dickhoff): Reunion at the University: The 26th "Emeriti Meeting" took place in the University Senate meeting room at the end of May.
At the end of May, 19 professors took part in the ‘Emeriti Meeting’, the reunion of retired UPB professors, to learn about new projects and current topics at the university and to exchange ideas with former colleagues.
After a welcome from Prof Dr Volker Peckhaus, the Presidential Board's representative for alumni affairs, Dr Christof Eigner, Head of Laboratories and Scientific Infrastructure at the Institute of Photonic Quantum Systems (PhoQS),…
On May 28, a total of 14 ninth and tenth grade students from Hüffertgymnasium Warburg and Gymnasium Marianum Warburg came to Paderborn University to attend a workshop on holography as part of a program to promote gifted students.
In addition to a short lecture on holography and holograms, they also made their own small holograms for their smartphones. Research at the university was also on show: Together with the Institute for Photonic Quantum…
Dr. Benjamin Brecht and Prof. Jan Sperling were invited speakers at the Quantum Information Spring School "Photonic Quantum Technologies" in Les Houches, France. While Jan Sperling introduced the concepts underlying multimode quantum correlations, Benjamin Brecht gave an introduction to the nitty gritty details of parametric down-conversion in the optics lab. Both presentations were well received and sparked numerous inspiring discussions with…
Image (Paderborn University, K. Türk): The PhoQS project HedwiQ was represented at HANNOVER MESSE 2024. The first implementation ideas for the project were presented. A survey was also carried out on the graphic realization of the learning material associated with the project.
This year's HANNOVER MESSE took place from April 22nd to 26th. Over 130,000 visitors were able to impressively experience how innovative technologies can be used now and in the future in business and society.1
As part of the joint stand "Your Quantum Future", the BMBF initiatives "Quantum Futur Education" and "Quantum Aktiv" were also represented at HANNOVER MESSE – including the PhoQS project HedwiQ. The scientists involved presented the…
Optica Student Chapter opened at Paderborn University
A new Optica Student Chapter recently opened at Paderborn University. With the successful application, undergraduate and graduate students can now assemble in the Chapter for exchange, social gatherings, workshops, invited lectures and other activities. The Chapter’s vision is to form a vibrant exchange among students in optics and photonics across Paderborn University, as well as to increase…
We have demonstrated that a single nonlinear optical waveguide and a spectral pulse shaper can be used to realize frequency-encoded networks with up to 64 inputs and outputs. In our experiment, a bright laser pulse with a shaped complex spectrum is used to realize networks in a so-called quantum pulse gate. The spectrum of the laser pulse defines the structure of the network as well as the output that we look at. By changing the spectrum, we…
Auch im Jahr 2024 hat das Department Physik der Universität Paderborn wieder am Girls'Day mitgemacht und neun interessierten Schülerinnen einen Einblick in die Funktion von Hologrammen, in das Studium und in die Forschung gegeben.
Hologramme kennt man vor allem aus Science Fiction Filmen - im diesjährigen Girls'Day konnten die Teilnehmerinnen aber ein eigenes, kleines Hologramm bauen, das mithilfe eines Handyvideos läuft. Was man in der…
Photograph (University of Paderborn, J. Babai-Hemati): Lithium niobate sample with periodically poled waveguides as an integrated optical frequency doubler. With the help of micro-heaters temperature profiles can be specifically adjusted to improve the efficiency of the conversion process.
How micro-heaters can be used to specifically improve the efficiency and spectral characteristics of non-linear processes.
Nonlinear frequency conversion, such as second harmonic generation, is widely used in various areas of photonics. Conversion based on χ(2)-nonlinear optical interactions can be very efficient in waveguide structures. In practice, however, the ideal properties are limited due to inhomogeneities along the interaction range,…
Picture (Paderborn University): Participants of the HedwiQ Kickoff-Meeting, from left to right: Christopher Buchholz, Marc Peters (Atrineo AG), Marc Ebert, Prof. Dr. Klaus Jöns, PD Dr. Sonja Barkhofen, Dr. Jennifer Krüger, Dr. Hermann Kahle. Missing in the picture: Prof. Dr. Katrin Temmen and Dr. Simone Klein (VDI Technologiezentrum GmbH).
The official kick-off meeting of the project HedwiQ – Heranführung der Generation Z an die Denkweise in der Quantenphysik took place on 11 March 2024. After a joint lunch, the project participants exchanged views on the various focal points of the HedwiQ project. On the one hand, there was an information block in which quantum research at Paderborn University and the promotion of young talent and outreach at the Institute for Photonic Quantum…
On the evening of 7 March, the PhoQS institute welcomed 25 members of the Lionsclub Paderborn-Carolus. After a lecture on quantum technologies by Prof. Dr. Christine Silberhorn, PhoQS members gave insights into current research topics via guided laboratory tours and a poster presentation. All participants were very interested in the research activities of PhoQS.
Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs
On-demand generation of high-quality photon states is key for implementing quantum information processing protocols. For high brightness deterministic photon sources, such as semiconductor quantum dots placed inside an optical resonator, emitter re-excitation is one of the problems undermining the quality of generated photons.
In the…
Image (Paderborn University, Maximilian Protte and Timon Schapeler): Phase-dependent nonlinear quadrature operator for the vacuum state and a weak coherent state.
Have you ever thought of using superconducting single-photon detectors for homodyne detection?
In their newest publication, Maximilian Protte and Timon Schapeler from the group Mesoscopic Quantum Optics show how superconducting nanowire single-photon detectors (SNSPDs) can be used to study the continuous variables of optical quantum states using homodyne detection. From the joint click statistics of two SNSPDs, they measured the phase-dependent…
